My colleague Jeff Young has a blog - Q6 - where he is discussing issues around the design and deployment of OpenURL 1.0. it is aimed at those with some familiarity with OpenURL.
The first thing to notice is that OpenURL 1.0 blows the doors off of OpenURL 0.1. OpenURL is no longer limited to citation linking. The abstractions provided in the OpenURL 1.0 model extend its range to encompass any imaginable web service. Not enough people realize the significance of this. [Q6]